Chemistry help with ionic equations and observations?

Gjrb

New member
I have the following reactions:
Carbonate ions + Nitric acid
Sulphate ions + nitric acid + barium nitrate
Chloride ions + nitric acid + silver nitrate
Magnesium ions + sodium hydroxide
Aluminium ions + sodium hydroxide
For the ions, i dont know what the compound is but apparently they were all, potassium or sodium, but we dont need to know as they are spectator ions. How can i write these in ionic equation and more importantly, how can i know if they are exothermic. If you know for sure any of these are exothermic, it would be great for me to know
 
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